If the person responsible for an activity which violates this subchapter cannot be determined, the owner, lessee or occupant of the property on which the activity is located shall be deemed responsible for the violation. A person found responsible under this section shall be guilty of a civil infraction punishable by a fine of $50 to $500 plus costs. For a second offense within a two-year period, the fine shall be $100 to $500 plus costs. For third and subsequent offenses within a two-year period, the fine shall be $200 to $500 plus costs.